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Multicast mode applies to high-speed networks with multiple
clients but do not require high precision. In a typical scenario,
one or more clock servers on the network periodically send multicast
packets to clients, and the clients synchronize time based on the
multicast packets.

Relevant commands need to be run on both the server and
client.

The client can be synchronized to the server. The server
cannot be synchronized to the client.

Manycast mode applies to scenarios where servers are scattered
throughout a network. Once discovered, the client can synchronize
with the closest manycast server. Manycast mode applies to scenarios
where servers are unstable and network clients do not require reconfiguration
if server characteristics or configuration change.

Relevant commands need to be run on both the server and
client.

Note that the client can be synchronized to the server.
The server cannot be synchronized to the client.

NOTE:

Switches can function as both an NTP
server and NTP client.

If a source address from which NTP packets
are sent is specified on the server, the address must be identical
to the server IP address of the client. If these addresses differ,
the client will be unable to process the NTP packets sent by the server.
This will result in clock synchronization failure.

Procedure

Unicast Client/Server Mode

NOTE:

In the unicast client/server
mode, only the client and the NTP primary clock on the server require
configuration.

Once the server clock is synchronized, the server
can function as a clock server. Other devices can then be synchronized
to that server. When the clock stratum of the server is greater than
or equal to the clock stratum of the client, the client will not synchronize
to the server.

To configure multiple servers, run the ntp-service unicast-server command repeatedly.
The optimal clock is that which the client selects as the preferred
clock.